Abstract
AbstractThe ontogeny of behavioral state cycles in white rats has been studied from their 2nd to their 30th day of life. A scale of 5 behavioral states, based on operationally defined categories was employed: state 1: quiet sleep; state 2: active sleep; state 3: quiet wakefulness; state 4: active wakefulness and state 5: locomotion. The percentage of time which young rats spend awake is 2% on the 2nd day, increases then and remains at about 40–60% after the 11th day. Until the 10th day the total sleep time is equally distributed between active sleep and quiet sleep state. After that day a decrement in the relative amount of active sleep occurs. The mean duration of single epochs spent in state 1 increases from less than 1 min on the first days to 6–8 min at about the 25th day. State 2 and state 4 epochs increase only slightly whereas state 3 and state 5 epochs do not show a particular trend.
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